The invention pertains to a method for determining whether a rotor is good in magnetic induction by measuring the electromotive force (emf) of a motor. A standard stator of the motor is prepared as the standard of measurement. A set of induction coil is wound upon the standard stator so that when the...http://www.google.se/patents/US6686761?utm_source=gb-gplus-sharePatent US6686761 - Method for determining whether a rotor is good in magnetic induction by measuring the EMF of a motor
